Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0ca54bc5590d0d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 02:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a88b5b06a4e51628a762c87463ffbe5e SHA-1: 37eee020a36b3992959ce7d69f185c322d14c751 SHA-256: ad0ca54bc5590d0d8f28a95911d52ca8e80b133e25ff83ac474feac35cdacd54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classification and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The PDF's structure and the presence of external URIs suggest it's used as a lure, likely for phishing or to download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=connect+android+phone+to+xbox+360 PDF link annotation
    • http://studiorapizza.it/userfiles/files/28567203139.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/daruzagewakubumetimixi.pdfIn PDF document text
    • http://24cvety.ru/upload/files/48288249228.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/29762550940.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/lokirif.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/jiwitemokigejopofesodi.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905130036812074.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/taxevibavijul.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/lenotoxikipoluwulofemis.pdfIn PDF document text
    • https://membermimpi.com/contents/files/35786028628.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/90337764804.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/34263631179.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/rikejofesarununedutuso.pdfIn PDF document text
    • http://kodemari.info/data/files/95141035758.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/75b00d79c4a4aaa9126f88998e962599/velujepopiwam.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/5ba820be5c5f060dde732174929574a3/geloxozumipazo.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/25804544884.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/19602186385.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5udolrjg5th6uob5lubjodes8v/15896760385.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/dotaber.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/75898149380.pdfIn PDF document text
    • https://linker.tw/files/jelowisa.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/34929934279.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dc735c6f0ec93abec78fd1193ef7be06/nitemegazamudurabaxavef.pdfIn PDF document text
    • http://idcla.net/upload/files/22168435028.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/varipagarijokuzugorapo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51D 14444 bytes
SHA-256: ee6fc76b668c4b804bf48de776c19ad0345e69b2ddc09ff880038c33f6ccad72
font_01_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 11132 bytes
SHA-256: 1bb97a4df1f9b1d399c3cc7ad8e0fc2bb0bea4c84921e37215f7b529e62cbef6

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